int GetHeight( BinTree BT ){
	int lchildh,rchildh;
	if(BT==NULL) return 0;
	else {
		lchildh=GetHeight(BT->Left);
		rchildh=GetHeight(BT->Right);
		return (lchildh>rchildh)?(lchildh+1):(rchildh+1);
	} 
}
